Forge Validation

Q: What is a Claude Code skill and how does the Forge Validation skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Forge Validation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-06-01

Schema-first input validation at every trust boundary. zod / valibot / pydantic, derive-types-from-schema, structured field-level error responses, env validation at startup, file upload sniffing, size caps. Contains ready-to-paste schemas, type derivation, error-mapping helper, env validator. Use whenever data crosses a trust boundary - HTTP, queue, file upload, env, third-party API responses.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

You are writing code that accepts untrusted input. Default agent-written validation is "we check that email is a string in the handler, that should be enough." It is not. Validation belongs at every trust boundary, declared with a schema library, and returning structured errors that the client can act on. This skill exists to make that systematic.

What this skill does

Forge Validation is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/forge-validation/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use whenever data crosses a trust boundary - HTTP, queue, file upload, env, third-party API responses.

Who uses this skill

The Forge Validation Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 146,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/forge-validation
curl -L https://claudskills.com/skills/forge-validation/SKILL.md \
  -o ~/.claude/skills/forge-validation/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/forge-validation/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/forge-validation/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\forge-validation\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Forge Validation Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/forge-validation/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Forge Validation skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Forge Validation skill?

Use Forge Validation when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Forge Validation" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Forge Validation skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Forge Validation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/f4rkh4d/forge-skill/blob/HEAD/skills/backend/forge-validation/SKILL.md
License: MIT
Author: f4rkh4d
Website: https://f4rkh4d.github.io/forge-skill/

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

f4rkh4d. (2026). Forge Validation [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/forge-validation/

BibTeX

@misc{forge-validation-2026,
  author    = {f4rkh4d},
  title     = {Forge Validation [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/forge-validation/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/forge-validation.svg)](https://claudskills.com/skills/forge-validation/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-07-06 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
⚠ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/forge-validation/#security)

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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